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  #1 (permalink)  
Old 11-09-2020, 01:39 PM
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Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
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Smoking Battery !!!

Hey Guys

My 2005 Big Bear is smoking batteries.
The powertrain is based on a 1999 Harley Evo with a 32 amp charging system.

I was out and about for a short ride the other day, when I started to smell something weird; kind of a sweet smell, by the time a got back there was smoke jetting out of both sides of my 1 year Deka AGM battery and the case was too hot to touch.

The vendor replaced the battery, but the same thing happened yesterday.

I haven't begun to troubleshoot, but i'm thinking the regulator is over charging the battery.

Any ideas on how to find the root cause.

Thank you
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  #2 (permalink)  
Old 11-10-2020, 04:27 PM
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Quote:
Originally Posted by BostonShovel View Post
Hey Guys

My 2005 Big Bear is smoking batteries.
The powertrain is based on a 1999 Harley Evo with a 32 amp charging system.

I was out and about for a short ride the other day, when I started to smell something weird; kind of a sweet smell, by the time a got back there was smoke jetting out of both sides of my 1 year Deka AGM battery and the case was too hot to touch.

The vendor replaced the battery, but the same thing happened yesterday.

I haven't begun to troubleshoot, but i'm thinking the regulator is over charging the battery.

Any ideas on how to find the root cause.

Thank you
Have you put a meter on the battery while it's running to see what the voltage is ?
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  #3 (permalink)  
Old 11-10-2020, 04:57 PM
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Voltage

Put my voltmeter on the battery terminals.
At idle it is 14 Volts
As I rev it it climbs to to 16+ v

I'm guessing my regulator is not regulating, time for a new one

Thank you for the input
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  #4 (permalink)  
Old 11-11-2020, 03:15 AM
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Make sure the regulator has a good earth.
Try running the earth direct to the battery.
I've seen this on Honda CBR900's many times in the past (It's a common fault on the Mk1 CBR's).
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